CN109071282A

CN109071282A - Ballast water processing device and ballast water treatment approach

Info

Publication number: CN109071282A
Application number: CN201680085001.8A
Authority: CN
Inventors: 藤原茂树; 长藤雅则; 冈本幸彦; 下野勇祐
Original assignee: JFE Steel Corp
Current assignee: JFE Steel Corp; JFE Engineering Corp
Priority date: 2016-04-26
Filing date: 2016-04-26
Publication date: 2018-12-21
Also published as: WO2017187531A1; EP3450403A1; US20190202721A1; US10669173B2; KR20180136543A; KR102133663B1; EP3450403A4

Abstract

A kind of ballast water processing device and ballast water treatment approach are provided, wherein, the supply amount of required oxidant can be made to become suitably according to the water quality of raw water, even if the supply amount of the oxidant is after supplying oxidant into the raw water being drawn for water ballast from stopping by also ensuring that the biological oxidant concentration for being enough to kill in raw water for a long time.In said device, storage unit (23) stores the first corresponding relationship between the absorbance of the raw water and the concentration of the dissolved organic carbon of the raw water, and the second corresponding relationship between the concentration and required remaining oxidizing agent concentration of the storage dissolved organic carbon, in order to kill the biology in raw water, and inhibit the proliferation again of the biology in the water being stored in ballast tank, remaining oxidizing agent concentration and required remaining oxidizing agent concentration when the required remaining oxidizing agent concentration is as after supply oxidant by the stipulated time, computing unit (24) is referring to the corresponding relationship, derive required remaining oxidizing agent concentration corresponding with the absorbance of raw water measured by absorbance meter (21), and required remaining oxidizing agent concentration is set as control target value to calculate the supply amount of required oxidant.Accordingly, control unit (25) control oxidation agent feeding device (5).

Description

Ballast water processing device and ballast water treatment approach

Technical field

The present invention relates to the processing unit for the water ballast being loaded in ballast tank of ship and processing methods.

Background technique

For ship typically, for zero load or in load in the state of few, due to being necessary to ensure that propeller enters water Depth and safe navigation when ensuring zero load etc., thus before leaving the port by the water (seawater, lake water or river water) at harbour take to Ballast tank is using as water ballast.In contrast, for being mounted with the ship of water ballast in ballast tank, when it is carried out in harbour When loading, water ballast is discharged from ballast tank.However, when travelling to and fro between environment different loading ports and port of discharge Ship carries out when taking and draining of water ballast in each harbour, and the organism for including in the water at some harbour is at another port Mouth can be discharged to another harbour together with water ballast, thus may cause to the littoral ecosystem at another harbour Baneful influence.Therefore, at 2 months 2004, passed through in the international conference about the ballasting water management of ship for ship The international treaties of control and the management of water ballast and deposit, according to the international treaties, it is obligated in water ballast biology into Row processing.

International Maritime Organization (IMO) is for the biological treatment in water ballast and defined standard is (referred to as at IMO water ballast Reason standard) in, it is specified that: as ship be discharged water ballast contained in 50 μm or more biology (predominantly zooplankter) number Amount is less than 10/m³, the quantity of 10 μm of biologies (predominantly phytoplankton) more than and less than 50 μm be less than 10/ml, The quantity of comma bacillus is less than 1cfu/100ml, and the quantity of coliform is less than 250cfu/100ml, and enterococcal number Amount is less than 100cfu/100ml.

Japanese Unexamined Patent Publication 2007-144391 bulletin (patent document 1) and JFE Engineering Co., Ltd, ship ballasting water pipe Reason system, [online], [retrieval on April 13rd, 2016], internet < URL:http: //www.jfe-eng.co.jp/ Products/comfortable/marine/mar01.html > (non-patent literature 1), which individually discloses, to be had to as being used for The seawater of the raw water of water ballast is filtered to capture the filter device of the aquatile in seawater and to filtered seawater Ballast water treatment dress of the middle supply as the sterilization agent feeding device of the oxidant of the fungicide for killing the bacterium in seawater It sets.

In each ballast water processing device of patent document 1 and non-patent literature 1, use sodium hypochlorite etc. as sterilization Agent, and the supply amount of fungicide is adjusted so that the concentration of sterilant (cl concn) being injected into the seawater of ballast tank becomes predetermined Debita spissitudo (steady state value).

For example, the supply of fungicide is adjusted in the ballast water processing device of non-patent literature 1 with being described generally below Amount.Firstly, predefining the concentration of sterilant in deemed appropriate seawater.Next, receiving the supply of fungicide Meanwhile the concentration of sterilant that measurement is injected into the seawater of ballast tank.Then, it by measured concentration of sterilant and predefines Concentration of sterilant compare, determine that measured concentration of sterilant is above or below predetermined concentration of sterilant. Then, by the feedback control based on the judgement result, to carry out the output adjustment or setting of the pump for supplying fungicide The aperture of valve in fungicide supply lines adjusts, to adjust fungicide supply amount.In general, above-mentioned predetermined sterilization Agent concentration has acceptable prescribed limit.In this case, the amount of the above-mentioned fungicide supplied as described above is adjusted to So that measured concentration of sterilant is in the defined range (hereinafter also referred to " target concentration range ").

After having supplied fungicide, due to fungicide and reacting for the organic matter in seawater or dividing for fungicide itself Solution reaction, so that the concentration of sterilant for the seawater being stored in ballast tank is reduced with the time.As a result, being stored in ballast tank Seawater in, organism may be proliferated again or the ovum of planktonic organism may hatch.Therefore, above-mentioned to be stored in seawater In residual concentration of sterilant (after the stipulated time, the concentration of remaining fungicide in the seawater of above-mentioned storage) need to tie up Hold the degree in the hatching for the ovum of proliferation or planktonic organism again for being able to suppress above-mentioned aquatile.

For organic in the water (seawater, lake water or river water, hereinafter, being referred to as " raw water " in the present specification) of water ballast The content (water quality) of object is dramatically different according to the stop harbour of ship.Also, fungicide is reacted with the organic matter in raw water Degree (in other words, the concentration of sterilant in raw water at any time the degree of reduction) depends on the water quality of raw water.Therefore, with It is past, it is dense that the target concentration range of above-mentioned concentration of sterilant is set as the fungicide set than the raw water relative to standard water quality Higher wide scope is spent, so that being able to maintain that enough residual concentration of sterilant to the raw water of various water quality, also, will be to original The fungicide supply amount of water is adjusted so that the concentration of sterilant in the raw water for being injected into ballast tank in above-mentioned target concentration range It is interior.

Existing technical literature

Patent document

1 Japanese Unexamined Patent Publication 2007-144391 of patent document

Non-patent literature

Non-patent literature 1:JFE Engineering Co., Ltd, ship ballasting water management system, [online], [April 13 in 2016 Day retrieval], internet < URL:http: //www.jfe-eng.co.jp/products/comfortable/marine/ mar01.html>

Summary of the invention

Problems to be solved by the invention

If using oxidant as fungicide, and the target of the oxidant concentration of the raw water of various water quality will be corresponded to Concentration range is set as the higher wide scope of the concentration of sterilant set than the raw water relative to standard water quality, then oxidant Expense will increase, and oxidant is reacted with the organic matter in raw water and the harmful substances such as the haloform that generates in raw water Yield increases.Due to being discharged water ballast from ballast tank, thus the harmful substance that increases of yield may be to ship around Environment adversely affect.In addition, decomposing the remaining oxidizing agent in water ballast when water ballast to be discharged from ballast tank With carry out it is innoxious in the case where, it is necessary to supply to the water ballast that is discharged, distintegrant for remaining oxidizing agent supply Amount must also increase, thus the expense of distintegrant also will increase.

In addition, when the amount of the organic matter in raw water is more, due to reacting for above-mentioned organic matter and above-mentioned oxidant, aoxidize Agent is consumed, thus from stopping supplying oxidant into raw water, after 1 day, it is stored in the water ballast in ballast tank Remaining oxidizing agent concentration is almost 0 sometimes.In this case, energy is handled to the organism in water ballast caused by oxidant Power (ability for killing planktonic organism contained in water ballast and bacterium) is insufficient, it is difficult to realize the ballast water treatment standard of IMO.

The purpose of the present invention is to provide a kind of ballast water processing device and ballast water treatment approach, wherein can will be in order to The oxidant supply amount for ensuring enough remaining oxidizing agent concentration and needing is set as appropriate amount corresponding with raw water quality, thus Even if after long-time, the biological treatment capabilities in water ballast can also be maintained from stopping supplying oxidant into raw water.

Means for solving the problems

In the seawater, lake water or river water (hereinafter, being referred to as " raw water " in the present specification) taken as water ballast There are gas chromatography, which greatly influences the water quality of raw water.The organic matter is roughly divided into water-soluble be dissolved with Machine object and water-insoluble non-dissolved organic matter, in entire organic matter, ratio shared by dissolved organic matter is high.In order to for The raw water of various water quality is the mode of amount appropriate to supply oxidant, needs accurately to hold the water of the raw water as object Matter.Present inventor by various seawater, lake water or river water measure absorbance and as it is representative dissolution it is organic The concentration (DOC concentration) of the dissolved organic carbon of object, to find that presence can be similar to almost between the absorbance and DOC concentration The corresponding relationship of straight line.Thereby, it is possible to derive DOC concentration from the measured value of absorbance, and can be from the DOC derived The water quality of concentration assurance raw water.

However, when using above-mentioned raw water as water ballast, if oxidant is supplied into the raw water to kill in the raw water Existing planktonic organism and bacterium, then known to the oxidant in raw water organic matter or ammonia react and decompose, as a result, in raw water Remaining oxidizing agent concentration (Total residual oxidant concentration: TRO concentration) reduce at any time.

Fig. 1 is to indicate TRO concentration in the raw water figure of the state of reduction at any time.Horizontal axis indicates elapsed time (minute), the longitudinal axis indicate TRO concentration (mg/L).In the case where using sodium hypochlorite as oxidant, TRO concentration is residual chlorine Concentration.The inventors of the present application found that if supplying oxidant into raw water, as shown in Figure 1, TRO concentration in the raw water according to Secondary experience transient response (Instantaneous reaction), initial reaction (Initial reaction), interim response (Intermediate reaction) these three reaction and reduce in a curve.Here, " transient response " be oxidant mainly with The reaction of ammonia, " initial reaction " are that oxidant is mainly reacted with dissolved organic matter, " interim response " be oxide mainly with it is non- The reaction of dissolved organic matter and the reaction as caused by the decomposition of oxidant itself.As will appear from figure 1, TRO concentration It can sharply be reduced due to transient response and in a short time at once after oxidant supply, next, TRO concentration is anti-due to initial stage It should be to more can slowly be reduced in several minutes of internal ratio transient responses, next, TRO concentration is since interim response is to can be Long-time internal ratio initial reaction is more slowly reduced.In addition we know, the organic matter in raw water is more, then the reduction of oxidant Reduction amount when amount, particularly in the early stage reaction is bigger.

In order to carry out the processing for meeting IMO ballast water treatment standard to raw water, into raw water supply oxidant after by Time point (such as after 24 hours) after enough time, it is necessary to ensure that the TRO concentration of required bottom line is to meet IMO ballast water treatment standard.Therefore, as shown in Figure 1, it is contemplated that TRO concentration is reduced at any time, thus derive by oxidant with TRO concentration during the initial reaction of dissolved organic matter reaction is set as adjusting control target used when oxidant supply amount Value.

For the TRO concentration set when adjusting oxidant supply amount as control target value, oxygen is not set it to TRO concentration when agent supplies, but the TRO during setting it to the initial reaction that oxidant is reacted with dissolved organic matter is dense Degree.Thus, it is possible to which (namely oxidant mainly reacts to make with ammonia the transient response occurred before avoiding reacting in the early stage The reaction of TRO concentration sharply reduction) setting of the control target value of TRO concentration is had an impact.By setting in this way Target value is controlled, so as to be adjusted to oxidant supply amount to waste few suitable amount.

So, from the measured value of raw water absorbance derive dissolved organic carbon (DOC) concentration to hold the water quality of raw water, Then dissolved organic matter is mainly reacted in above-mentioned initial reaction with oxidant, and present inventor is conceived to as a result, Corresponding relationship and dissolved organic carbon concentration and initial reaction and mid-term between raw water absorbance and dissolved organic carbon concentration is anti- Corresponding relationship between the reduction behavior for the TRO concentration answered, to contemplate: deriving to meet and be directed to various absorbances Raw water IMO ballast water treatment standard and the TRO concentration that needs, and derive the oxygen needed to realize the TRO concentration Agent supply amount.

In addition, as the index for meeting IMO ballast water treatment standard, it is preferred to use the TRO concentration in specified time limit Time integral value (referred to as CT value).Fig. 2 is the figure for illustrating the CT value of TRO concentration, and the CT value of the TRO concentration is by Fig. 1 Expression TRO concentration reduce the curve of behavior and indicate elapsed time horizontal axis between area indicate.In Fig. 2, TRO concentration is reduced when after oxidant supply by 3 minutes to 2.5mg/L, from 5.0mg/L when oxidant supplies in oxygen By being reduced when 360 minutes (1 hour) to 1.0mg/L, then, by 1440 minutes (1 after oxidant supply after agent supply Day) when reduce to 0.4mg/L.In Fig. 2, calculate since oxidant supply when after 1440 minutes (the interim response phase Between time point) TRO concentration during this time integral value CT value.Here, the expression TRO concentration that CT value is equivalent to Fig. 2 subtracts Area after the curve of few behavior and expression oxidant supply between the horizontal axis of elapsed time.

As an example, present inventor supplies the oxygen of various concentration into the raw water that DOC concentration is 2.0mg/L Agent, the reduction at any time of research TRO concentration, in addition, carried out research for ensure even if after oxidant supply by CT value needed for the TRO concentration of IMO ballast water treatment standard can also be met after 1440 minutes (1 days) (is opened when supplying from oxidant The CT value to begin after 1440 minutes during this) experiment.In addition, the raw water different from above-mentioned example for DOC concentration, Present inventor has also carried out identical experiment.By these test results be deduced as drawn a conclusion: oxidant with it is molten The initial reaction that reacts of solution organic matter terminates in several minutes, as long as in addition, above-mentioned CT value be 1500mg/L minutes with On, then can ensure that can also sufficiently meet IMO ballast water treatment mark even if having passed through 1440 minutes after (1 day) after oxidant supply Quasi- TRO concentration.

In addition, as described previously for the TRO concentration set when adjusting oxidant supply amount as control target value, TRO concentration when oxidant supply is not set it to, as long as but setting it to oxidant and dissolved organic matter generation instead TRO concentration during the initial reaction answered.Since initial reaction terminates in several minutes, thus as during initial reaction TRO concentration, the TRO concentration (TRO concentration when referred to as by 3 minutes) when having used after supply oxidant by 3 minutes makees To control target value.By making the CT value since when oxidant supplies during this after 1440 minutes (1 day) 1500mg/L minutes or more, so that can ensure that can also sufficiently expire after (1 day) even if after oxidant supply by 1440 minutes The TRO concentration of sufficient IMO ballast water treatment standard, thus such curve is selected, it shows that CT value 1500mg/ can be made The reduction behavior of L minutes or more TRO concentration, by the curve for showing the reduction behavior process 3 minutes when TRO it is dense Degree is set as required TRO concentration, and the required TRO concentration is set as control target value.In the example in figure 2, CT value is 1500mg/ L minutes or more, meet IMO ballast water treatment standard.TRO in the curve for showing the reduction behavior, when by 3 minutes Concentration is 2.5mg/L, and required TRO concentration is 2.5mg/L.Therefore, as long as TRO when by after supply oxidant by 3 minutes is dense The control target value of degree is set as 2.5mg/L, so as to adjust oxidant supply amount.

The present invention relates to a kind of ballast water processing device and ballast water treatment approach, wherein obtains raw water absorbance in advance It is required when after the DOC concentration and supply oxidant of corresponding relationship and raw water between DOC concentration by the stipulated time Corresponding relationship between TRO concentration is based on the corresponding relationship, will be in order to meet required for ballast water treatment standard, for oxygen supply Required TRO concentration when after agent by the stipulated time is set as controlling target value, and adjusts oxygen based on the control target value Agent supply amount.

The absorbance of raw water can be found out by measurement light transmittance.Light transmittance is the ratio that incident light penetrates sample, and And there is following relationship: absorbance=- log₁₀(light transmittance).It is above-mentioned to substitute by measurement raw water light transmittance in the present invention Raw water absorbance, so that ballast water treatment can also be carried out.

According to the present invention, as described below, it can obtain being related to first to fourth invention of ballast water processing device and be related to 5th to the 8th invention of ballast water treatment approach.

It is provided with according to each ballast water processing device of first to fourth invention: being drawn to as water ballast to ship Supply oxidant is in raw water (including seawater, lake water and river water) in the ballast tank of oceangoing ship to kill the biological oxidant in raw water Feedway and confession to above-mentioned oxidant is supplied into the above-mentioned raw water being drawn via above-mentioned oxidation agent feeding device The oxidant supply amount control device being adjusted to amount.

About first invention, in related ballast water processing device, above-mentioned oxidant supply amount control device has: Measure absorbance meter, storage unit, computing unit and the control unit of the absorbance of the above-mentioned raw water being drawn.The storage Unit stores the corresponding relationship between raw water absorbance and the concentration of the dissolved organic carbon of the raw water as the first corresponding relationship, Corresponding relationship between the concentration and required remaining oxidizing agent concentration of the dissolved organic carbon for storing raw water simultaneously is as second pair It should be related to.Above-mentioned required remaining oxidizing agent concentration further suppresses while killing the biology in raw water and is stored in ballast tank In water ballast in biology proliferation again, thus above-mentioned required remaining oxidizing agent concentration be as into raw water for oxygen supply Remaining oxidizing agent concentration and required remaining oxidizing agent concentration when after agent by the stipulated time.Above-mentioned computing unit is referring to upper The first corresponding relationship is stated, to derive corresponding to the dense of the dissolved organic carbon of raw water absorbance as measured by absorbance meter Degree derived above-mentioned is dissolved with next, above-mentioned computing unit is referring to above-mentioned second corresponding relationship with above-mentioned to derive The corresponding above-mentioned required remaining oxidizing agent concentration of the concentration of machine carbon, and using the required remaining oxidizing agent concentration derived as control Target value processed is to calculate the required supply amount of oxidant.Above-mentioned control unit control oxidation agent feeding device, thus will be by upper The oxidant for stating the calculated required supply amount of computing unit is supplied into the raw water taken by oxidation agent feeding device.

So, in first invention, first and second corresponding relationship stored by referring to storage unit, according to reality The absorbance of the raw water of border measurement, thus derive in water ballast it is remaining, in order to meet IMO ballast water treatment standard and (required remaining oxidizing agent is dense for the concentration of required remaining oxidizing agent when supplied after above-mentioned oxidant into raw water by the stipulated time Degree), and the required remaining oxidizing agent concentration is set as control target value, it is thus possible to it is supplied according to the water quality of raw water into raw water To the oxidant for the appropriate amount that can sufficiently meet IMO ballast water treatment standard.In addition, in first invention, by computing unit The oxidant concentration in raw water when the required remaining oxidizing agent concentration derived not is oxidant supply, but for oxygen supply In raw water when after agent by the stipulated time remaining oxidant concentration.Therefore, by passing through the stipulated time for above-mentioned Time point be set as between (for example) oxidant and the dissolved organic matter in raw water react occur when time point, so as to Enough oxidants for more accurately calculating above-mentioned appropriate amount.

About the second invention, in related ballast water processing device, above-mentioned oxidant supply amount control device has: Measure absorbance meter, storage unit, computing unit and the control unit of the absorbance for the raw water being drawn.The storage unit Store the corresponding relationship between the absorbance of raw water and required remaining oxidizing agent concentration.Above-mentioned required remaining oxidizing agent concentration While killing the biology in raw water, the proliferation again of the biology in the water ballast being stored in ballast tank is further suppressed, because And above-mentioned required remaining oxidizing agent concentration be as into raw water supply oxidant after by the stipulated time when residual oxidization Agent concentration and required remaining oxidizing agent concentration.Above-mentioned computing unit referring to above-mentioned corresponding relationship, thus derive correspond to by The above-mentioned required remaining oxidizing agent concentration of raw water absorbance measured by absorbance meter, and the required residual oxidization that this is derived Agent concentration calculates the required supply amount of oxidant as control target value.Above-mentioned control unit control oxidant supply dress It sets, so that being taken being supplied by the oxidant of above-mentioned computing unit supply amount needed for calculated to by oxidation agent feeding device In raw water.

So, in the second invention, the above-mentioned corresponding relationship stored by referring to storage unit, according to actual measurement Raw water absorbance, thus derive in water ballast it is remaining, in order to meet IMO ballast water treatment standard and to raw water By remaining and meeting in water ballast when the stipulated time required for IMO ballast water treatment standard after the middle above-mentioned oxidant of supply The concentration (required remaining oxidizing agent concentration) of remaining oxidizing agent, and the required remaining oxidizing agent concentration is set as control target value, Thus in the same manner as above-mentioned first invention, supply it can sufficiently meet IMO ballasting according to the water quality of raw water and into raw water The oxidant of the appropriate amount of water process standard.In addition, in first invention referring to the case where first and second corresponding relationship compared with, Institute's reference at this time be only raw water absorbance with after supplying above-mentioned oxidant into raw water by remaining on when the stipulated time It is in raw water, in order to which (required remaining oxidizing agent is dense for the concentration that meets IMO ballast water treatment standard and required remaining oxidizing agent Degree) between direct corresponding relationship, it is thus possible to more simply derive above-mentioned required remaining oxidizing agent concentration.

It is invented about third, in related ballast water processing device, above-mentioned oxidant supply amount control device has: Measure transmitance meter, storage unit, computing unit and the control unit of the light transmittance for the raw water being drawn.The storage unit Store the corresponding relationship between the light transmittance of raw water and the concentration of the dissolved organic carbon of the raw water as the first corresponding relationship, together When, the corresponding relationship stored between the concentration of the dissolved organic carbon of raw water and required remaining oxidizing agent concentration is corresponding as second Relationship.Above-mentioned required remaining oxidizing agent concentration is further suppressed and is stored in ballast tank while killing the biology in raw water Water ballast in biology proliferation again, thus above-mentioned required remaining oxidizing agent concentration be as into raw water for oxidizing Remaining oxidizing agent concentration and required remaining oxidizing agent concentration when after agent by the stipulated time.Above-mentioned computing unit is referring to above-mentioned First corresponding relationship, thus derive the concentration corresponding to the dissolved organic carbon of raw water light transmittance as measured by transmitance meter, Next, above-mentioned computing unit is referring to above-mentioned second corresponding relationship, to derive organic with above-mentioned derived above-mentioned dissolution The corresponding above-mentioned required remaining oxidizing agent concentration of the concentration of carbon, and using the required remaining oxidizing agent concentration derived as control Target value processed is to calculate the required supply amount of oxidant.Above-mentioned control unit control oxidation agent feeding device, so that will It is supplied by the oxidant of above-mentioned computing unit supply amount needed for calculated into the raw water taken by oxidation agent feeding device.

About the 4th invention, in related ballast water processing device, above-mentioned oxidant supply amount control device has: Measure transmitance meter, storage unit, computing unit and the control unit of the light transmittance for the raw water being drawn.The storage unit Store the corresponding relationship between the light transmittance of raw water and required remaining oxidizing agent concentration.Above-mentioned required remaining oxidizing agent concentration While killing the biology in raw water, the proliferation again of the biology in the water ballast being stored in ballast tank is further suppressed, because And above-mentioned required remaining oxidizing agent concentration be as into raw water supply oxidant after by the stipulated time when residual oxidization Agent concentration and required remaining oxidizing agent concentration.Above-mentioned computing unit referring to above-mentioned corresponding relationship, thus derive correspond to by The above-mentioned required remaining oxidizing agent concentration of raw water light transmittance measured by transmitance meter, and the required residual oxidization that this is derived Agent concentration calculates the required supply amount of oxidant as control target value.Above-mentioned control unit control oxidant supply dress It sets, so that by being supplied by the oxidant of above-mentioned computing unit supply amount needed for calculated to by oxidation agent feeding device institute In the raw water taken.

Had according to the ballast water treatment approach of the 5th to the 8th invention: to being drawn as water ballast to the pressure of ship It carries and supplies oxidant in the raw water in cabin to kill the oxidant supplying step of the biology in raw water and supply in oxidant The oxidant supply amount rate-determining steps that the supply amount of the oxidant of raw water is adjusted are supplied in step.

About the 5th invention, in related ballast water treatment approach, oxidant supply amount rate-determining steps have: measurement The absorbance measuring process of the absorbance for the raw water taken, the derivation step of dissolved organic carbon concentration, required remaining oxidizing agent The calculating step and rate-determining steps of supply amount needed for the derivation step of concentration, oxidant.In above-mentioned dissolved organic carbon concentration It derives in step, the corresponding relationship between the concentration of dissolved organic carbon that reference is previously obtained, raw water absorbance and the raw water That is the first corresponding relationship, to derive raw water corresponding with raw water absorbance measured in above-mentioned absorbance measuring process Dissolved organic carbon concentration.In the derivation step of above-mentioned required remaining oxidizing agent concentration, referring to be previously obtained, raw water Dissolved organic carbon concentration and required remaining oxidizing agent concentration between corresponding relationship i.e. the second corresponding relationship, to derive Residual oxidization needed for corresponding with the concentration of above-mentioned dissolved organic carbon derived in the derivation step of the organic concentration of carbon of solvent Agent concentration.Above-mentioned required remaining oxidizing agent concentration further suppresses while killing the biology in raw water and is stored in ballast tank In water ballast in biology proliferation again, thus above-mentioned required remaining oxidizing agent concentration be as into raw water for oxygen supply Remaining oxidizing agent concentration and required remaining oxidizing agent concentration when after agent by the stipulated time.It is supplied needed for above-mentioned oxidant To the required residual oxidization that in the calculating step of amount, will be derived in the derivation step of above-mentioned required remaining oxidizing agent concentration Agent concentration is set as control target value to calculate the required supply amount of oxidant.In above-mentioned rate-determining steps, control oxidant is supplied To step, so that will be calculated in the calculating step of the supply amount as needed for above-mentioned oxidant in oxidant supplying step The oxidant of required supply amount supply into the raw water taken.

About the 6th invention, in related ballast water treatment approach, above-mentioned oxidant supply amount rate-determining steps have: Measure the absorbance measuring process of absorbance, the derivation step of required remaining oxidizing agent concentration, the oxidant of taken raw water The calculating step and rate-determining steps of required supply amount.

In the derivation step of above-mentioned required remaining oxidizing agent concentration, referring to be previously obtained, raw water absorbance and institute The corresponding relationship between remaining oxidizing agent concentration is needed, to derive and above-mentioned raw water measured in absorbance measuring process Remaining oxidizing agent concentration needed for absorbance is corresponding.Above-mentioned required remaining oxidizing agent concentration is killing the biology in raw water Meanwhile the proliferation again of the biology in the water ballast being stored in ballast tank is further suppressed, thus above-mentioned required residual oxidization Remaining oxidizing agent concentration and required residual oxygen when agent concentration is as after the supply oxidant into raw water by the stipulated time Agent concentration.In the calculating step of the supply amount needed for above-mentioned oxidant, by the derivation step of above-mentioned required remaining oxidizing agent concentration The required remaining oxidizing agent concentration derived in rapid is set as control target value to calculate the required supply amount of oxidant.Upper It states in rate-determining steps, oxidant supplying step is controlled, so that will be as needed for above-mentioned oxidant in oxidant supplying step In the calculating step of supply amount it is calculated needed for the oxidant of supply amount supply into the raw water taken.

About the 7th invention, in related ballast water treatment approach, above-mentioned oxidant supply amount rate-determining steps have: Measure Transmissivity measurement step, the derivation step of dissolved organic carbon concentration, required residual oxygen of the light transmittance of taken raw water The calculating step and rate-determining steps of supply amount needed for the derivation step of agent concentration, oxidant.It is dense in above-mentioned dissolved organic carbon In the derivation step of degree, referring to pair between light transmittance be previously obtained, raw water and the concentration of the dissolved organic carbon of the raw water It should be related to i.e. the first corresponding relationship, to derive corresponding with raw water light transmittance measured in above-mentioned Transmissivity measurement step Raw water dissolved organic carbon concentration.In the derivation step of above-mentioned required remaining oxidizing agent concentration, reference is previously obtained , corresponding relationship i.e. the second corresponding relationship between the concentration and required remaining oxidizing agent concentration of the dissolved organic carbon of raw water, from And it derives opposite with the concentration of dissolved organic carbon of above-mentioned raw water derived in the derivation step of the organic concentration of carbon of solvent The required remaining oxidizing agent concentration answered.Above-mentioned required remaining oxidizing agent concentration also presses down while killing the biology in raw water The proliferation again of the biology in the water ballast being stored in ballast tank has been made, thus above-mentioned required remaining oxidizing agent concentration is to make Remaining oxidizing agent concentration and required remaining oxidizing agent concentration when for after the supply oxidant into raw water by the stipulated time.? In the calculating step of supply amount needed for above-mentioned oxidant, by what is derived in the derivation step of the required remaining oxidizing agent concentration Required remaining oxidizing agent concentration is set as control target value to calculate the required supply amount of oxidant.In above-mentioned rate-determining steps, Oxidant supplying step is controlled, so that walking the calculating of the supply amount as needed for above-mentioned oxidant in oxidant supplying step The oxidant of the calculated required supply amount of institute is supplied into the raw water taken in rapid.

About the 8th invention, in related ballast water treatment approach, above-mentioned oxidant supply amount rate-determining steps have: Measure the Transmissivity measurement step of light transmittance, the derivation step of required remaining oxidizing agent concentration, oxidant of taken raw water The calculating step and rate-determining steps of required supply amount.In the derivation step of above-mentioned required remaining oxidizing agent concentration, reference Corresponding relationship between light transmittance be previously obtained, raw water and required remaining oxidizing agent concentration, to derive and transmitance Remaining oxidizing agent concentration needed for measured above-mentioned light transmittance is corresponding in measuring process.Above-mentioned required remaining oxidizing agent is dense It spends while killing the biology in raw water, further suppresses the proliferation again of the biology in the water ballast being stored in ballast tank, Residual oxygen when thus above-mentioned required remaining oxidizing agent concentration is as after the supply oxidant into raw water by the stipulated time Agent concentration and required remaining oxidizing agent concentration.It is in the calculating step of the supply amount needed for above-mentioned oxidant, this is required residual The required remaining oxidizing agent concentration derived in the derivation step of oxidant concentration is stayed to be set as control target value to calculate oxygen The required supply amount of agent.In above-mentioned rate-determining steps, oxidant supplying step is controlled, thus will in oxidant supplying step In the calculating step of the supply amount as needed for above-mentioned oxidant it is calculated needed for the oxidant of supply amount supply to being taken In raw water.

The effect of invention

Ballast water processing device and ballast water treatment approach according to the present invention, are stored by referring to by storage unit Corresponding relationship, thus obtain it is corresponding with the absorbance for the raw water of actual measurement taken or light transmittance needed for remain oxygen Agent concentration, and the required remaining oxidizing agent concentration is set as control target value, it is thus possible to according to the water quality of raw water to institute The oxidant for reaching the appropriate amount (supply amount needed for oxidant) of IMO ballast water treatment standard is supplied in the raw water taken. Therefore, the expense of ballast water treatment can be reduced, while being able to suppress oxidant and reacting with the organic matter in raw water and generate The yield of the harmful substances such as haloform, and prevent harmful substance from adversely affecting to surrounding enviroment.In addition, working as ballasting When water is discharged from ballast tank, it can also reduce innoxious required to carry out in order to make to remain on the decomposition of the oxidant in water ballast Oxidant distintegrant usage amount.As a result, it is possible to reduce the expense required when water ballast to be discharged from ballast tank.

In addition, in the present invention, the required remaining oxidizing agent concentration derived referring to above-mentioned corresponding relationship is killing original While biology in water, the proliferation again of the biology in the water ballast being stored in ballast tank is further suppressed, thus it is above-mentioned Required remaining oxidizing agent concentration be as into raw water supply oxidant after by the stipulated time when remaining oxidizing agent concentration and Required remaining oxidizing agent concentration, so, by by the above-mentioned time point by the stipulated time be set as (for example) oxidant with The time point to react between dissolved organic matter in raw water, so as to set above-mentioned required oxidant supply amount appropriate It is set to more accurate amount.

Brief Description Of Drawings

[Fig. 1] is to indicate TRO concentration in the raw water figure of the state of reduction at any time.

[Fig. 2] is the figure for illustrating the CT value of the TRO concentration in raw water.

[Fig. 3] is the figure for schematically showing the structure of ballast water processing device according to one embodiment.

[Fig. 4] is the flow chart for showing the operation of the control oxidant supply amount using the ballast water processing device of Fig. 3.

Specific embodiment

Hereinafter, embodiments of the present invention will be illustrated based on the drawings.

In the present embodiment, it is illustrated in the case of killing the biology in raw water when loading water ballast.Firstly, The structure of ballast water processing device involved in present embodiment is described in detail.Fig. 3 is to schematically show this The figure of the structure of ballast water processing device involved in embodiment.The ballast water processing device setting of present embodiment is not being schemed In the hull of the ship shown, which has: raw water, which takes route 1, is set to raw water takes pump on route 1 3 and filter device 4, be connected to raw water take route 1 oxidation agent feeding device 5 and oxidant supply amount control device 6, with it is former Water takes the mixing arrangement 7 of the end connection of route 1 and send water from the sterilization processing water that mixing arrangement 7 extends to ballast tank 9 Route 8.

Raw water take route 1 by pump 3 operating from the raw water admission port of hull by around hull raw water (seawater, Lake water or river water) it introduces.Raw water is drawn into raw water and taken in route 1 by pump 3, while it being conveyed to ballast tank 9.Filter device 4 are arranged in the downstream side for the pump 3 that raw water is taken in route 1, are filtered to being inhaled into raw water and taking the raw water in route 1, It is removed from raw water to will be present in organism in raw water, including relatively large planktonic organism class.

Oxidation agent feeding device 5 is taken via raw water to be located at the inlet 13 in the downstream side of filter device 4 and connects in route 1 It is connected to raw water and takes route 1.Oxidation agent feeding device 5 is supplied the oxidant as fungicide to by mistake by inlet 13 It filters in the filtered raw water of device 4 (crossing drainage), to kill do not filtered by filter device 4 including bacterium class and float Microorganism including trip biology.The control oxidation agent feeding device 5 of oxidant supply amount control device 6, so as to adjust by oxidant Feedway 5 supplies the supply amount that the oxidant in the raw water in route 1 is taken to raw water.Mixing arrangement 7 is supplied in oxidant The end that raw water takes route 1 is connected at the downstream side of the inlet 13 of device 5.Oxygen has been supplied by oxidation agent feeding device 5 Agent and filtered raw water (crossing drainage) are directed into mixing arrangement 7, filtered raw water from the end that raw water takes route 1 (crossing drainage) mixes with oxidant, so that the oxidant is fully spread in filtered raw water (crossing drainage).It kills as a result, Organism including microorganism in filtered raw water (crossing drainage).

Sterilization processing water send water line 8 by it is from mixing arrangement 7, be killed comprising the organism including microorganism Raw water (referred to here as sterilization processing water) is delivered to ballast tank 9.Ballast tank 9 is connected to the end that sterilization processing water send water line 8, And the sterilization processing water from the conveying of water line 8 will be sent to save as water ballast by sterilization processing water.

Hereinafter, by further being carried out specifically to above-mentioned multiple constituent elements of the ballast water processing device of present embodiment It is bright.

Filter device 4:

Filter device 4 is by the organism contained in raw water, including relatively large planktonic organism class from the raw water Middle removing, the raw water are the raw water suction inlets by pump 3 from the lateral position for being set to hull (not shown) as described above It takes to raw water and takes in route 1.The filter device 4 of the embodiment has the filter that eyelet is 10 to 200 μm.Eyelet It is 10 to 200 μm of filters while keeping the catch rate of a degree of zooplankter and phytoplankton, also reduces The backwash frequency of filter is to shorten in the ballast water treatment time for stopping harbour.In other words, if the eyelet of filter is more than 200 μm, then the catch rate of zooplankter and phytoplankton significantly reduces, if the eyelet of filter, less than 10 μm, backwash frequency increases Add, it is elongated in the ballast water treatment time for stopping harbour, thus be not preferred.In particular, if the use of eyelet being about 20 to 35 μ The filter of m can then be such that above-mentioned catch rate and above-mentioned backwash frequency optimizes, thus be preferred.Further, it is expected that Filter device 4 can obtain 200m per hour³Above rate of filtration (ability).But as long as above-mentioned filtering velocity excessively can be obtained It spends (ability), then filter area can also be made to miniaturise by the stacking of multiple filtering modules.

Aoxidize agent feeding device 5:

As shown in figure 3, oxidation agent feeding device 5 has: storing the oxidant storage tank 11 of oxidant, from oxidant storage tank 11 The pipeline 12 of the extension of route 1 is taken, the front end of pipeline 12 is set to and is connected to original to the downstream side of filter device 4 towards raw water Water is taken the inlet 13 of route 1, is set on pipeline 12 and conveys the oxidant in oxidant storage tank 11 to inlet 13 At the downstream of supply pump 14 and the supply pump 14 being set in pipeline 12 and to by supply pump 14 from oxidant storage tank 11 Inlet 13 is transported to (in the present embodiment, to be transported to raw water from oxidant storage tank 11 and take filtered original in route 1 Water (cross drainage)) oxidant the valve 15 that is adjusted of supply amount.

As oxidant, sodium hypochlorite, chlorine, chlorine dioxide, sodium dichloro cyanurate or two kinds in these can be used Above mixture, but oxidant in addition to these also can be used.

By inlet 13, agent feeding device 5 is aoxidized to taking to raw water and takes raw water in route 1 (in this embodiment party In formula, the filtered raw water (crossing drainage) in route 1 is taken to raw water) supply oxidant.As described later, oxidant supply dress It sets 5 to be controlled by oxidant supply amount control device 6, supply in the raw water in route 1 can be taken to raw water sufficiently to expire The oxidant of the appropriate amount of sufficient IMO ballast water treatment standard.

Mixing arrangement 7:

For example, mixing arrangement 7 can be stirred by silent oscillation mixer (static mixer) or stirring blade are rotary-type Device etc. is constituted, for being supplied with the filtered raw water (crossing drainage) of oxidant by aoxidizing agent feeding device 5, from original Water takes the end of route 1 and is fed to mixing arrangement 7, and mixing arrangement 7 is by filtered raw water (cross drainage) and oxidant It is sufficiently mixed so that oxidant is spread in filtered raw water (crossing drainage).It so, in the present embodiment, will be by mixed It attaches together the filtered raw water set 7 and be diffused with oxidant and is known as sterilization processing water.

Oxidant supply amount control device 6:

Oxidant supply amount control device 6 has: be set to raw water take in route 1 oxidation agent feeding device 5 it is upper Trip side (in the present embodiment, is arranged in the downstream side of filter device 4 and aoxidizes the upstream of the inlet 13 of agent feeding device 5 Side) absorbance meter 21.The measurement of absorbance meter 21, which is drawn to raw water, takes in route 1 and by the filtered original of filter device 4 The absorbance of water (crossing drainage).Oxidant supply amount control device 6 is also equipped with: being set to the downstream side of oxidation agent feeding device 5 The sterilization processing water of (in the present embodiment, being set to the downstream side of mixing arrangement 7) send the meter of the TRO in water line 8 22 and stream Meter 26.The sterilization processing water that 22 measurement of TRO meter is fed with oxidant by aoxidizing agent feeding device 5 is sent in water line 8 Sterilization processing water (in the present embodiment, supplied after oxidant through by mixing arrangement 7 by aoxidizing agent feeding device 5 so that The oxidant diffusion sterilization processing water) in remaining oxidizing agent concentration (Total residual oxidant concentration: TRO is dense Degree).The measurement of flowmeter 26 send water line 8 via sterilization processing water from mixing arrangement 7 and is delivered to the sterilization processing water of ballast tank 9 Flow.Oxidant supply amount control device 6 is also equipped with: the storage unit 23 of first and second aftermentioned corresponding relationship of storage, Calculating of first and second the above-mentioned corresponding relationship stored referring to the storage unit 23 to calculate supply amount needed for oxidant Unit 24 and the control that oxidation agent feeding device 5 is controlled based on supply amount needed for the oxidant calculated by computing unit 24 Unit 25 processed.

The measurement of absorbance meter 21 takes the absorbance of the water quality indicator of the raw water in route 1 in raw water as being drawn, and The measurement data is exported to computing unit 24.In the present embodiment, as described above, absorbance meter 21 is due to being arranged in raw water The upstream side in the downstream side of the filter device 4 in route 1, the inlet 13 for aoxidizing agent feeding device 5 is taken, thus is measured Raw water before supplying oxidant by oxidation agent feeding device 5 takes the absorbance of the raw water in route 1.When absorbance meter 21 is surveyed When amount raw water takes the absorbance of the raw water in route 1, used wavelength is preferably 260nm at this time, this is because it is suitble to The index of organic concentration in using absorbance as raw water.

22 measurement of TRO meter is discharged and is delivered to from mixing arrangement 7 after having supplied oxidant by oxidation agent feeding device 5 Ballast tank 9, sterilization processing water send the TRO concentration in the sterilization processing water in water line 8, and its measurement data exported to meter Calculate unit 24.In the present embodiment, TRO meter 22 is measured is taken in route 1 by the supply of oxidation agent feeding device 5 to raw water Predetermined point of time during the initial reaction that the oxidant of raw water is mainly reacted with the dissolved organic carbon in raw water is (at this In embodiment for oxidant supply after have passed through 3 minutes when time point) when TRO concentration (hereinafter referred to as " initial reaction TRO concentration ").Therefore, TRO meter 22 is arranged in oxidant has been supplied by the inlet 13 of oxidation agent feeding device 5 after The sterilization processing water that sterilization processing water is reached after 3 minutes send the downstream position in water line 8.In addition, TRO meter 22 is surveyed The above-mentioned initial reaction TRO concentration in predetermined time (present embodiment is 1 minute) is measured.In addition, for counting 22 pairs via TRO Sterilization processing water after having supplied oxidant carries out the measurement opportunity of initial reaction TRO concentration mensuration, in the present embodiment will It is set as the time point into raw water after supply oxidant after 3 minutes, but the measurement opportunity can also be anti-in the early stage Any time point during answering.

As described below, the first corresponding relationship and the second corresponding relationship has been stored in advance in storage unit 23.

[the first corresponding relationship]

First corresponding relationship is pair between the absorbance of raw water and the concentration (DOC concentration) of the dissolved organic carbon of the raw water It should be related to.First corresponding relationship obtains in the following way.Firstly, for the original obtained from the different multiple waters of water quality Water measures absorbance and DOC concentration.Next, for example, using absorbance as horizontal axis (x-axis) and using DOC concentration as the longitudinal axis (y) in the coordinate diagram of axis, absorbance obtained by each raw water in above-mentioned multiple waters is derived to measurement and DOC concentration is mapped, so Linear fit is carried out to the corresponding relationship being derived between absorbance involved in each raw water in all waters and DOC concentration afterwards. It is above-mentioned first corresponding relationship as the relational expression (y=ax+b) by linear function obtained by above-mentioned linear fit, and should First corresponding relationship is stored in advance by storage unit 23.

[the second corresponding relationship]

Second corresponding relationship is between the concentration (DOC concentration) of the dissolved organic carbon of raw water and required remaining oxidizing agent concentration Corresponding relationship.Here, required remaining oxidizing agent concentration further suppresses while killing the biology in raw water and is stored in ballast The proliferation again of biology in water ballast in cabin, thus above-mentioned required remaining oxidizing agent concentration is supplied as into raw water Remaining oxidizing agent concentration and required remaining oxidizing agent concentration when have passed through the stipulated time after oxidant.Second corresponding relationship Acquisition is got according to following.Firstly, measurement is derived from the DOC concentration of the raw water in some waters.In addition, being supplied into the raw water more The oxidant of kind concentration measures remaining oxidizing agent concentration (Total residual for the oxidant of each concentration Oxidant concentration: TRO concentration) reduction at any time.

Next, being calculated since supplying oxidant for for the oxidant for being supplied respectively to a variety of concentration the case where Until in interim response predetermined point of time (in the example in figure 2 for oxidant supply after have passed through 1440 minutes after (1 day) Time point) TRO concentration in this period of time time integral value (CT value).Then, from the oxidant for supplying various concentration In the case where in the CT value that is respectively obtained, select satisfaction have passed through 1440 minutes after oxidant supply (1 day) when foot To reach the minimum CT value of the CT value (in the example in figure 2 for 1500mg/L minutes) of IMO ballast water treatment standard.For supplying The case where having given the oxidant as the concentration of above-mentioned selected CT value, derives TRO concentration when initial reaction, that is, supplies The TRO concentration at the time point after oxidant after 3 minutes (is in the example in figure 2 2.5mg/L), and as required TRO concentration.It is deduced required TRO concentration corresponding with the raw water of some DOC concentration as a result,.

According to above-mentioned main points, for each raw water in multiple waters, its DOC concentration and required TRO concentration are found out, and total The corresponding relationship between the DOC concentration of above-mentioned each raw water and required TRO concentration is born, obtains the corresponding relationship as second pair It should be related to.Second corresponding relationship is stored in advance together with above-mentioned first corresponding relationship by storage unit 23.

Computing unit 24 is derived and referring to the first corresponding relationship being stored in storage unit 23 by 21 institute of absorbance meter The corresponding DOC concentration of the raw water absorbance measured.In addition, computing unit 24 is referring to second pair be stored in storage unit 23 It should be related to, derive above-mentioned required TRO concentration corresponding with above-mentioned derived DOC concentration, and the institute derived with this It needs TRO concentration as control target value, regularly calculates the required supply amount of oxidant.Specifically, computing unit 24 is logical The required supply amount for crossing oxidant when following formula (1) calculates the control update opportunity of each predetermined circulation, and to oxidant Required supply amount is updated.

m_m=m_m-1+a×(PV_m-SV)×Q_AVE,n-1/Q_r×G (1)

m_m: the required supply amount (L/ minutes) of this oxidant

m_m-1: the required supply amount (L/ minutes) of last oxidant

PV_m: the measured value (mg/L) of this TRO concentration

The control target value (mg/L) of SV:TRO

Q_r: the metered flow (m of sterilization processing water²/H)

Q_AVE,n-1: the average value (m of the measured value of this sterilization processing water flow³/H)

(being averaged for the measured value of the sterilization processing water flow before control update opportunity between 10 seconds in the present embodiment Value)

A: in the metered flow Q of sterilization processing water_rUnder, for the oxidant for supplying oxidant concentration as 1mg/L It measures (L/ minutes)

G: gain

Required supply amount of the control unit 25 based on the oxidant calculated by computing unit 24, to control oxidant supply The revolving speed of the supply pump 14 of device 5 and the aperture of valve 15.As a result, oxidation agent feeding device 5 passes through inlet 13 to original Water takes the oxidant for the required supply amount that the supply of the raw water in route 1 is calculated by computing unit 24.

Next, being illustrated for the integrated operation of ballast water processing device involved in present embodiment.When to pressure When carrying the loading raw water of cabin 9, raw water is taken the pump 3 on route 1 and is operated, and takes route 1 via raw water and suck raw water To hull, next, the filter device 4 on route 1 is taken by raw water, it will be than the eyelet of the filter in filter device 4 The organisms such as big planktonic organism take in the raw water in route 1 from raw water and remove.

Next, by oxidation agent feeding device 5, in by the filtered raw water of filter device 4 (crossing drainage) for oxygen supply Agent.Specifically, the supply pump 14 for making to aoxidize on the pipeline 12 of agent feeding device 5 operates, and at the same time in opening conduits 12 Valve 15, so that taking supply in the raw water (cross drainage) in route 1 to raw water by inlet 13 is stored in oxidant storage Oxidant in slot 11.The revolving speed of supply pump 14 and the aperture of valve 15 are controlled by oxidant supply amount control device 6, Thus the supply amount of oxidant is adjusted.Explanation is controlled to the supply amount of oxidant by oxidant supply amount control device 6 later.

After the supply oxidant in filtered raw water (crossing drainage), mixing arrangement 7 is by filtered raw water and aoxidizes Agent mixing, so that oxidant be made fully to be diffused in filtered raw water (crossing drainage).As a result, having killed filtered original Organism in water (crossing drainage).The drainage excessively that organism has been killed is discharged as sterilization processing water from mixing arrangement 7.

The sterilization processing water being expelled in sterilization processing water line 8 from mixing arrangement 7 send water line 8 via sterilization processing water And it is stored in ballast tank 9 using as water ballast.The oxidant concentration in water ballast in ballast tank 9 is reduced with the time, But the oxidant remained in water ballast inhibits the proliferation again of the organism in water ballast (for example, aquatile is again The hatching of the ovum of secondary proliferation and planktonic organism).

When water ballast is discharged from ballast tank 9, oxidant (not shown) decomposes agent feeding device to being discharged from ballast tank 9 Supply is for decomposing the distintegrant of oxidant to carry out the harmless treatment of water ballast in water ballast.

Hereinafter, the oxygen that explanation is carried out when running ballast water processing device by oxidant supply amount control device 6 The control of agent supply amount operates.As described below, the operation of ballast water processing device includes: from bringing into operation (i.e. from the beginning of Raw water is sucked into raw water and takes time point in route 1) until " the initial stage supply by being carried out until some predetermined time Mode operation " and since processing terminate is until killing the organism in raw water the initial stage supply model end of run " operation of TRO control model " only carried out.

[operation of initial stage supply model]

About above-mentioned " predetermined time " for carrying out primary supply model operation, it is set to no less than aftermentioned TRO control The running control of molding formula updates the time of circulation time.In the present embodiment, control is updated into circulation as described later Time is set as 6 minutes, and above-mentioned " predetermined time " is set to have more within 6 minutes 10 minutes of 4 minutes margin times than this.

In the operation of primary supply model, in order to ensure to filtered raw water (in the present embodiment be cross drainage) into Row organism killing processing, slightly excessively supplies a certain amount of oxidant into above-mentioned filtered raw water.

[operation of TRO control model]

The operation circulation time controlled about oxidant supply amount when running to TRO control model, (control updated Circulation time), it sets it to the time of the no less than total time including the following time: being fed with the filtered original of oxidant Water (the being in the present embodiment drainage excessively) time required when reaching at the position of TRO meter 22 (is in the present embodiment 3 points Clock) and pass through TRO meter 22 measurement TRO concentration needed for the time (being in the present embodiment 1 minute).In present embodiment In, control update circulation time is set to 6 minutes that 2 minutes margin times are had more than above-mentioned total time (4 minutes).

Fig. 4 is the flow chart for indicating the control operation of the oxidant supply amount when TRO control model is run.It will firstly, working as When raw water is drawn into ballast tank 9, by the absorbance of the filtered raw water of filter device 4 (being supplied to the raw water before oxidant) (S1) is measured by absorbance meter 21.The measured value of measured absorbance is output to computing unit 24.In this embodiment party In formula, since initial stage supply model operation after by 8 minutes, then at the time point after 2 minutes in carry out multiple suction Photometric measurement, computing unit 24 calculate the average value of the measured value of absorbance.

Computing unit 24 is derived and above-mentioned absorbance measurement referring to the first corresponding relationship being stored in storage unit 23 The corresponding DOC concentration (S2) of the average value of value.

Next, computing unit 24 referring to the second corresponding relationship being stored in storage unit 23, is derived and institute in S2 TRO concentration needed for the DOC concentration of derivation is corresponding, and the TRO concentration that this is derived is set as TRO control target value (S3).Required TRO concentration during the required TRO concentration is initial reaction.Preferably, to TRO control target value setting A certain range of blind area.

After S3, by TRO meter 22 measure into the filtered raw water being delivered in ballast tank 9 for oxidizing TRO concentration (initial reaction TRO concentration) when after agent by the predetermined time is supplying and at the same time being measured by flowmeter 26 The flow (S4) for the sterilization processing water for having given oxidant to convey with backward ballast tank 9.By measured initial reaction TRO concentration and The data of flow are exported to computing unit 24.10 seconds before the control update opportunity that computing unit 24 calculates oxidant supply amount Between sterilization processing water flow measured value average value.

Computing unit 24 based on above-mentioned formula (1) calculate this control update opportunity when oxidant required supply Measure m_m(S5).At this point, as the target value SV (mg/L) of TRO control, having used and having been pushed away in above-mentioned S3 in above-mentioned formula (1) Derived value, the average value Q of the measured value as ballasting water flow_AVE,n-1(m²/ H) and this TRO concentration measured value PV_m (mg/L), the obtained value in S4 has been used.

In addition, when PVm-SV value (i.e. the measured value of this TRO concentration and TRO control target value difference) for 0 with When lower, the gain G in formula (1) is set to be greater than 1 numerical value, such as is set to 1.5；When above-mentioned difference is greater than 0, formula (1) In gain G be set to 1.The reasons why setting gain G in this way is as described below.

When the difference for the target value that the measured value of this TRO concentration and TRO are controlled is 0 or less, that is to say, that when this TRO concentration measured value ratio TRO control target value it is low when, carry out increase oxidant required supply amount control.However, When the supply amount of oxidant is larger, the reduction amount of TRO concentration caused by transient response becomes larger, if thus make gain G 1 with Under, although then increasing the required supply amount of oxidant, the reduction of TRO concentration due to caused by transient response is larger, Thus the initial reaction TRO concentration after supplying oxidant after 3 minutes may be lower than the target value of TRO control.Cause This, by the way that gain G to be set greater than to 1 numerical value, so as to the target for controlling initial reaction TRO concentration close to TRO Value.In addition, for example, even if in the case where by gain G, to be set as about 1.2 be appropriate, in order to make initial reaction TRO concentration in early stage The target value for just reaching TRO control, it is also preferred that gain G is set as slightly greater numerical value (for example, about 1.5).

When the difference for the target value that the measured value of this TRO concentration and TRO are controlled is greater than 0, that is to say, that when this When the target value of the measured value ratio TRO control of TRO concentration is high, the control for reducing the required supply amount of oxidant is carried out.Work as oxidation When the supply amount of agent is smaller, the reduction amount of TRO concentration caused by transient response becomes smaller, if thus making number of the gain G greater than 1 Value, although then reducing the required supply amount of oxidant, the reduction amount of TRO concentration due to caused by transient response compared with It is small, thus the initial reaction TRO concentration after supplying oxidant after 3 minutes may be more than the target value of TRO control. Therefore, by the way that gain G to be set as to the numerical value less than 1, so as to the mesh for controlling initial reaction TRO concentration close to TRO Scale value.In addition, for example, even if in the case where by gain G, to be set as about 0.7 be appropriate, in order to make initial reaction TRO concentration in morning Phase just reaches the target value of TRO control, it is also preferred that gain G is set as slightly greater numerical value (for example, about 1.0).

In order to in S5 calculated oxidant required supply amount m_mTo supply oxidant, control unit into raw water 25 have carried out the control of the aperture of the revolving speed of supply pump 14 and valve 15, so as to adjust the supply amount (S6) of oxidant.

In the present embodiment, although updating opportunity in the control of each preset predetermined circulation to carry out in principle The control of S4 to S6 operates, but when the target for being located at TRO control by the initial reaction TRO concentration of 22 measurement of TRO meter in S4 When within the scope of the blind area of value, without S5 and S6, but needed for set oxidant when the control update opportunity of last time Supply amount come continue supply oxidant.

As described above, in the present embodiment, corresponding to and closing by referring to first and second being stored in storage unit 23 System, derive it is corresponding with actually measured raw water absorbance needed for TRO concentration and as control target value, thus energy It is enough to supply the oxidant that meet the appropriate amount of IMO ballast water treatment standard into raw water according to the water quality of raw water, and carry out Ballast water treatment appropriate.In addition, not being when being initially supplied oxidant by the required TRO concentration that computing unit 24 is derived TRO concentration, but the initial reaction TRO concentration after being initially supplied oxidant after the predetermined time, it is thus possible to calculate The oxidant more accurately measured is to meet IMO ballast water treatment standard.

In the first embodiment, the first corresponding relationship between reference absorbance and DOC concentration and DOC concentration and institute Both corresponding relationships of the second corresponding relationship between TRO concentration are needed to set TRO control target value.But the second embodiment party Formula is different from the first embodiment: setting only referring to the direct corresponding relationship between raw water absorbance and required TRO concentration Determine the target value of TRO control.

In this second embodiment, it derives the direct corresponding relationship between raw water absorbance and required TRO concentration and incites somebody to action It is as relational expression, and the direct corresponding relationship is as the first corresponding relationship and the second corresponding relationship illustrated in first embodiment It obtains, the relational expression is then pre-stored within storage unit 23.The relational expression is indicated by formula below (2) or formula (3).

SV=a × T_AVE ²+b×T_AVE+c (2)

SV=d × T_AVE+e (3)

SV: required TRO concentration (TRO controls target value) (mg/L)

T_AVE: the average value of the absorbance repeatedly measured in the given time

A, b, c, d, e: constant

Constant a, b, c, d and e absorbance, DOC concentration and institute according to obtained by measurement raw water in formula (2) and formula (3) TRO concentration is needed to determine.For example, the multiple raw waters different for absorbance, present inventor measure its absorbance, When DOC concentration and TRO concentration, the following numerical value in formula (2): a=-12.5, b=28.5, c=2.5 is obtained, and obtain Following numerical value in formula (3): d=10.5 and e=1.16.

In addition to computing unit 24 comes referring to the corresponding relationship (i.e. above-mentioned formula (2) or formula (3)) being stored in storage unit 23 Derive it is corresponding with absorbance measurement needed for TRO concentration and as control target value other than, in present embodiment The operation that oxidant supply amount is controlled via oxidant supply amount control device 6 it is identical with first embodiment.

So, in this second embodiment, due to only referring to direct right between raw water absorbance and required TRO concentration Should be related to the control target value to derive the TRO concentration during initial reaction, thus with reference as first embodiment The case where first and second corresponding relationship, is compared, and second embodiment can more simply derive required TRO concentration.

In first and second above-mentioned embodiment, the absorbance of raw water is measured, and according to the water quality of raw water by oxidant Supply amount control in amount appropriate, the absorbance of raw water can also be found out by measuring the light transmittance of raw water.Light transmittance is Incident light penetrates the ratio of sample, and has following relationship: absorbance=- log₁₀(light transmittance).It is measured as by absorbance Determine the substitution of raw water absorbance, the light transmittance of raw water can also be measured by luminous transmittance measuring, calculates absorbance, and with first And second embodiment similarly controls the supply amount of oxidant.In addition, such as being closed when measuring light transmittance to calculate absorbance It is formula: absorbance=- log₁₀(determination of light transmittance value+100- clear water light transmittance) (clear water light transmittance: the intrinsic value of luminous transmittance measuring) As shown, it can be corrected according to the intrinsic value of luminous transmittance measuring.

The explanation of symbol

1 raw water takes route

3 pumps

4 filter devices

5 oxidation agent feeding devices

6 oxidant supply amount control devices

7 mixing arrangements

8 sterilization processing water send water line

9 ballast tanks

11 oxidant storage tanks

12 pipelines

13 inlets

14 supply pumps

15 valves

21 absorbance meters

22TRO meter

23 storage units

24 computing units

25 control units

26 flowmeters

Claims

1. a kind of ballast water processing device, has: being supplied to being drawn in the raw water into the ballast tank of ship as water ballast Oxygen supply agent is to kill the oxidation agent feeding device of the biology in raw water and to via the oxidation agent feeding device and to institute It states and supplies the oxidant supply amount control device that the supply amount of the oxidant is adjusted in the raw water being drawn, feature exists In:

The oxidant supply amount control device has: the absorbance meter of the absorbance for the raw water being drawn described in measurement, storage Unit, computing unit and control unit,

The storage unit stores the corresponding relationship between the absorbance of the raw water and the concentration of the dissolved organic carbon of the raw water As the first corresponding relationship, while storing between the concentration of the dissolved organic carbon of the raw water and required remaining oxidizing agent concentration Corresponding relationship as the second corresponding relationship,

In order to also inhibit the increasing again of the biology in the water ballast being stored in ballast tank while killing the biology in raw water It grows, residual oxidization when the required remaining oxidizing agent concentration is as after the supply oxidant into raw water by the stipulated time Agent concentration and required remaining oxidizing agent concentration,

The computing unit derives the absorbance with the raw water measured by absorbance meter referring to first corresponding relationship The concentration of the corresponding dissolved organic carbon, next, the computing unit referring to second corresponding relationship, derive with The corresponding required remaining oxidizing agent concentration of the concentration of above-mentioned the derived dissolved organic carbon, and derived above-mentioned Required remaining oxidizing agent concentration be set as control target value to calculate the required supply amount of the oxidant,

Described control unit control oxidation agent feeding device, will be by the calculated required supply amount of the computing unit Oxidant is supplied into the raw water taken by the oxidation agent feeding device.

2. a kind of ballast water processing device, has: being supplied to being drawn in the raw water into the ballast tank of ship as water ballast Oxygen supply agent is to kill the oxidation agent feeding device of the biology in raw water and to via the oxidation agent feeding device and to institute It states and supplies the oxidant supply amount control device that the supply amount of the oxidant is adjusted in the raw water being drawn, feature exists In:

The storage unit stores the corresponding relationship between the absorbance of the raw water and required remaining oxidizing agent concentration,

The computing unit is derived opposite with the absorbance of the raw water measured by absorbance meter referring to the corresponding relationship Answer it is described needed for remaining oxidizing agent concentration, and by the above-mentioned required remaining oxidizing agent concentration derived be set as control target value with The required supply amount of the oxidant is calculated,

Described control unit control oxidation agent feeding device, will be by the calculated required supply amount of the computing unit Oxidant is supplied into the water taken by the oxidation agent feeding device.

3. a kind of ballast water processing device, has: being supplied to being drawn in the raw water into the ballast tank of ship as water ballast Oxygen supply agent is to kill the oxidation agent feeding device of the biology in raw water and to via the oxidation agent feeding device and to institute It states and supplies the oxidant supply amount control device that the supply amount of the oxidant is adjusted in the raw water being drawn, feature exists In:

The oxidant supply amount control device has: the transmitance meter of the light transmittance for the raw water being drawn described in measurement, storage Unit, computing unit and control unit,

The storage unit stores the corresponding relationship between the light transmittance of the raw water and the concentration of the dissolved organic carbon of the raw water As the first corresponding relationship, while storing between the concentration of the dissolved organic carbon of the raw water and required remaining oxidizing agent concentration Corresponding relationship as the second corresponding relationship,

In order to while killing the biology in raw water, also inhibit the organism in the water ballast being stored in ballast tank again Proliferation, residual oxygen when the required remaining oxidizing agent concentration is as after the supply oxidant into raw water by the stipulated time Agent concentration and required remaining oxidizing agent concentration,

The computing unit derives the light transmittance with the raw water measured by transmitance meter referring to first corresponding relationship The concentration of the corresponding dissolved organic carbon, next, the computing unit referring to second corresponding relationship, derive with The corresponding required remaining oxidizing agent concentration of the concentration of above-mentioned the derived dissolved organic carbon, and derived above-mentioned Required remaining oxidizing agent concentration be set as control target value to calculate the required supply amount of the oxidant,

4. a kind of ballast water processing device, has: being supplied to being drawn in the raw water into the ballast tank of ship as water ballast Oxygen supply agent is to kill the oxidation agent feeding device of the biology in raw water and to via the oxidation agent feeding device and to institute It states and supplies the oxidant supply amount control device that the supply amount of the oxidant is adjusted in the raw water being drawn, feature exists In:

The storage unit stores the corresponding relationship between the light transmittance of the raw water and required remaining oxidizing agent concentration,

The computing unit is derived opposite with the light transmittance of the raw water measured by transmitance meter referring to the corresponding relationship Answer it is described needed for remaining oxidizing agent concentration, and by the above-mentioned required remaining oxidizing agent concentration derived be set as control target value with The required supply amount of the oxidant is calculated,

5. a kind of ballast water treatment approach, has: being supplied to being drawn in the raw water into the ballast tank of ship as water ballast Oxygen supply agent is to kill the oxidant supplying step of the biology in raw water and be supplied to in the oxidant supplying step The oxidant supply amount rate-determining steps being adjusted to the supply amount of the oxidant of the water, it is characterised in that:

The oxidant supply amount rate-determining steps have: the absorbance of the absorbance for the raw water being drawn described in measurement measures step Suddenly, the meter of supply amount needed for the derivation step of dissolved organic carbon concentration, the derivation step of required remaining oxidizing agent concentration, oxidant Step and rate-determining steps are calculated,

In the derivation step of the dissolved organic carbon concentration, referring to absorbance and the raw water of raw water be previously obtained, described Corresponding relationship i.e. the first corresponding relationship between the concentration of dissolved organic carbon, derives and is surveyed with the absorbance measuring process The concentration of the dissolved organic carbon of the corresponding raw water of absorbance of the raw water obtained,

In the derivation step of the required remaining oxidizing agent concentration, the dissolution referring to raw water be previously obtained, described is organic Corresponding relationship i.e. the second corresponding relationship between the concentration of carbon and required remaining oxidizing agent concentration is derived organic with the dissolution Remaining oxidizing agent concentration needed for the concentration of the dissolved organic carbon derived in the derivation step of concentration of carbon is corresponding,

In the calculating step of the supply amount needed for the oxidant, it will be pushed away in the derivation step of the required remaining oxidizing agent concentration Remaining oxidizing agent concentration needed for derived is set as controlling required supply amount of the target value to calculate the oxidant,

In the rate-determining steps, the oxidant supplying step is controlled, thus will be by institute in the oxidant supplying step State in the calculating step of supply amount needed for oxidant it is calculated it is described needed for the oxidant of supply amount supply to described and taken In raw water.

6. a kind of ballast water treatment approach, has: being supplied to being drawn in the raw water into the ballast tank of ship as water ballast Oxygen supply agent is to kill the oxidant supplying step of the biology in raw water and be supplied to in the oxidant supplying step The oxidant supply amount rate-determining steps being adjusted to the supply amount of the oxidant of the raw water, are characterized in that:

The oxidant supply amount rate-determining steps have: measuring absorbance measuring process, the institute of the absorbance for the raw water being drawn The calculating step and rate-determining steps of supply amount needed for needing the derivation step of remaining oxidizing agent concentration, oxidant,

In the derivation step of the required remaining oxidizing agent concentration, referring to absorbance be previously obtained, the raw water with Corresponding relationship between required remaining oxidizing agent concentration is derived and the raw water that measures in the absorbance measuring process Remaining oxidizing agent concentration needed for absorbance is corresponding,

7. a kind of ballast water treatment approach, has: being supplied to being drawn in the raw water into the ballast tank of ship as water ballast Oxygen supply agent is to kill the oxidant supplying step of the biology in raw water and be supplied to in the oxidant supplying step The oxidant supply amount rate-determining steps being adjusted to the supply amount of the oxidant in the raw water, are characterized in that:

The oxidant supply amount rate-determining steps have: the Transmissivity measurement of the light transmittance for the raw water being drawn described in measurement Supply amount needed for step, the derivation step of dissolved organic carbon concentration, the derivation step of required remaining oxidizing agent concentration, oxidant Step and rate-determining steps are calculated,

Light transmittance and the raw water in the derivation step of the dissolved organic carbon concentration, referring to raw water be previously obtained, described Dissolved organic carbon concentration between corresponding relationship i.e. the first corresponding relationship, derive and institute in the Transmissivity measurement step The concentration of the dissolved organic carbon of the corresponding raw water of the light transmittance of the raw water measured,

In the derivation step of the required remaining oxidizing agent concentration, the dissolution referring to raw water be previously obtained, described is organic Corresponding relationship i.e. the second corresponding relationship between the concentration of carbon and required remaining oxidizing agent concentration is derived organic with the dissolution Remaining oxidizing agent needed for the concentration of the dissolved organic carbon of the raw water derived in the derivation step of concentration of carbon is corresponding is dense Degree,

In the calculating step of the supply amount needed for the oxidant, by institute in the derivation step of the required remaining oxidizing agent concentration The required remaining oxidizing agent concentration derived is set as controlling required supply amount of the target value to calculate oxidant,

In the rate-determining steps, the oxidant supplying step is controlled, thus will be by institute in the oxidant supplying step State in the calculating step of supply amount needed for oxidant it is calculated needed for the oxidant of supply amount supply to described and be drawn In raw water.

8. a kind of ballast water treatment approach, has: being supplied to being drawn in the raw water into the ballast tank of ship as water ballast Oxygen supply agent is to kill the oxidant supplying step of the biology in raw water and be supplied to in the oxidant supplying step The oxidant supply amount rate-determining steps being adjusted to the supply amount of the oxidant in the raw water, are characterized in that:

The oxidant supply amount rate-determining steps have: measuring Transmissivity measurement step, the institute of the light transmittance for the raw water being drawn The calculating step and rate-determining steps of supply amount needed for needing the derivation step of remaining oxidizing agent concentration, oxidant,

In the derivation step of the required remaining oxidizing agent concentration, referring to light transmittance be previously obtained, the raw water with Corresponding relationship between required remaining oxidizing agent concentration is derived and the light transmission measured in the Transmissivity measurement step Remaining oxidizing agent concentration needed for rate is corresponding,